Grinding machine



Dec. 8, 1931. J. H. HELMS 1,835,045

' GRINDING MACHINE Filed Aug. 5, 1929 2 Sheets-Sheet l INV EN TOR. JOHN A. HELMS Dec. 8, 1931. J. H. HELMS GRINDING MACHINE Filed Aug. 5, 1929 2 Sheets-Sheet 2 INVEN TOR. x/fiH/V A. #ELMS ATTORNEYS.

Patented Dec. 8, 1931 PATENT OFFICE JOHN H. HELMS, O]? FORTVILLE, INDIANA GRINDING MACHINE 1 Application filed August 5, 1929. Serial No. 383,609.

This invention appertains to polishing and grinding and more particularly to a novel device for grinding cylinders, particularly the; cylinders of' triple valves used in air brakes.

An important object of my invention is the provision of a novel device for truing and grinding the cylinders of triple valves e1nbodying novel means for holding the triple valve centered relative to the grinding tool, and novel means for feeding the grinding tool into the cylinder.

, Another important object of my invention is the provision of means for expanding and 1 contracting the grinding tool, said means acting to uniformly expand the tool whereby the cylinders will be uniformly ground in a true circle.

A still further object of my invention is to provide a grinding device for the cylinders of triple air valves of the above character, which will be durable and efficient in use, one that willbe simple and easy to manufacture and one which can be placed upon the market at a reasonable cost and permit the quick and expeditious grinding of the cylinders;

WVith these and other objects in view, the

- invention consists in the novel construction,

arrangement and formation of parts, as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawings, in which drawings:

Figure l is a fragmentary side elevation of my improved cylinder grinder showing the same in operation, parts of the grinder and the cylinder of the triple valve being shown in vertical section;

Figure 2 is a detail section taken on the line 2+2 of Figure 1 looking in the direction of the arrows illustrating the cylinder centering head and casing in top plan;

Figure '3 is aside elevation of the cylinder centering head and casing in side elevation showing parts thereof broken away and in section; a

Figure 4 is a section through the head taken on the line H of Figure 3;

Figure 5 is a top plan view of the centering bed for the triple valve cylinder;

Figure 6 is a detail section taken on the line 6-6 of Figure 1 looking in the direction of the arrows;

Figure 7 is a detail fragmentary side elevation showing the adjusting nut and the head for the grinding tool;

Figure 8 is a detail side elevation of the grinding tool;

Figure 9 is a top plan view of the grinding ring, and

F'gure 10 is a top plan view of one of the expanding disks for the grinding ring.

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter A generally indicates my improved grinding machine which comprises a bedor supporting plate 15 having secured theretothe upstanding pillar or post 16, the upper end of which is provided with a Y- shaped head 17. This head is provided with horizontally alined bearings 18 for the reception of an operating shaft 19, which may be driven in any preferred way. The forward edge of the Y-shaped head 17 supports a vertically disposed guide 20 which slidably receives the adjusting sleeve 21, one face of which is provided with a rack bar 22. This sleeve 21 has journaled therein and for sliding movement therewith the tool shaft 23 which has feathered thereon a bevel gear 24. This bevel gear 2% meshes with a bevel gear 25 keyed or otherwise secured to the drive shaft 19. By this construction the tool shaft can be raised and lowered by the sleeve 21 and the lower end of the shaft below the sleeve 21 is provided with a head 26 for connection with the grinder, which will be later described. The sleeve 21 can be raised and the lower end of the tool shank 23 and this socket is rigidly connected to the head by the use of a suitable thumb screw or the like 33. The lower end of the shank 3O provided with a reduced threaded extension 34 forming a shoulder 35 as can be seen by referring to Figure 1 of the drawing. This shank is rotatably mounted within a bearing sleeve 36, which is in turn received in the centeringhead or casing'37. A suitable key "and keyway 38 slidably connects the bearing sleeve 36 with the centering head 37 and thus the two are united'against rotary movement relative to one another, butthe sleeve is permitted of sliding movement relative to said head. The upper end of this sleeve is externally threaded as at 39 for the-reception of the adjusting nut 40 which can; be provided with a plurality of radially extending manipulating handies 41. The outer surface of this nut is preferably calibrated as at 42 for cooperation with a pointer 43 secured to the sleeve. The upper endof the nut 40 and the sleeve 36 bears against a suitable thrust bearing 44 carried in a protecting cap 45 which is keyed or otherwise secured to the shank30 as at 46. Theiower end of the shank carries a similar cap 47 which bears against a thrust bearing 48'; This thrust bearing 48 in turn bears against the grinding tool per se indicated by the reference character 49, which will now be described. V

The grinding tool per se comprises an upper tapered disk or cone 50 which is mounted directly on the shank 30 and a lower opposi tely disposed tapered disk or cone 51which is mounted on the threaded extension 34 of the shank against the shoulder 35 and held thereon by a suitable nut 52. Received between the tapered disks or cones'50 and 51 is a' resilient split ring 53, the outer surface of which carries suitable grinding material such as emery cloth or the like for engaging and grinding the walls of the cylinder of the triple valve indicated by the reference character 54. It isobvious that when the tapered cones 50 and 51 have been brought toward I one another, the split ring 53 will be uniformly expanded for bringing the same to the desired diameter and against the wall of the cylinder. Conversely when the tapered v disks or cones 50 and 51 are spread apart, the

split ring 53 is allowed to contract. By op erating the nut 40 against the thrust bearing 44, the sleeve '36 can he slid downwardly for moving the disk -50toward the disk '51. and

when the nut 40 is threaded against-the thrust bearing, the split ring is allowed to expand. In order to insure the proper rotation of the grinding tool 49, the lower disk 51 can carry a lug 55 which fits Within anotch 56'for-med in the lower edge of the split ring 53.

The head '37 can carry a depending lug 57 which is adapted to fit within a port hole 57 formed in the cylinder 54, so as to hold the head stationary on the cylinder and to center the cylinder relative thereto.

In order to effectively hold the cylinder 54 on thebed plate 15 and to properly center the same relative to the shank 30 I provide a novel holder or bed. This holder 58 is provided with a plurality of upstanding pins "59 which engage in openings 60 already formed in the cylinder 54. The plate 58 can be adjusted on the bed plate 15 by screws 61 which are threaded into brackets 62 mountedat appropriate points on the bed plate 15.

From the foregoing it is obvious that the grinding tool can beraisedand lowered into the cylinder byme'ans of the pinion 27 and the rack 22 and that the tool can be expanded or contracted by the nut 40. The shank can be rotated atthe desiredrate of speed by driving the shaft 19 at the required revolutions. V I

The head 37 is provided with openings 64 to allow the escape of the brass removed from the cylinders. The sleeve '36 'canbe provided with a suitable oil way 65 leading from the upper cap 45 for the thrust bearing 44 so that the lower thrust bearing can be lubricated. V

From the foregoing description it can be seen that I have provided an exceptionally simple and novel grinding device which will expeditiously and effectively grind the cylinders of triple valves true and accurately.

Changes in details-may be made without departing from the spirit or the scope of this invention, but p p p WhatI claim as new is: f M

1. A cylinder grinder comprising a bed, a post on said bed, bearings on the post, a rotatable shaftcarried by the bearings,means for rotating the shaft, a tool shaft slidably and rotatably carried by the post, means for rotating the tool shaft from the drive shaft, means for raising and lowering the tool shaft, a tool .shank,'means for coupling the tool shankito thetool shaft, means for anchoringa cylinder to be ground to the bed, acentering head for engaging the upper end of the cylinder, a bearing sleeve :slidably carried by saidcentering head, the shank being rotatably mounted in the sleeve, a bearing cap onthe shank, an adjusting nut threaded 'on' the sleeve, a thrust bearing interposed between the adjusting nut and cap, a reduced extension on the lowerend of the shank, a grinding" tool including a lower disk fitted onsaid reduced extension having its upper face tapered inwardly, an upper disk having its lower face tapered inwardly mounted on said shank, a split contracting ring mounted between said disks and engaging the ta- I 5 pered faces thereof, and a thrust bearing interposed between the upper disk and said sleeve.

2. In a cylinder grinding machine, a bed, a tool shank rotatably and slidably mounted 10 above the bed, a holding plate, means for adjusting the plate on the bed, centering pins carried by the holding plate for receiving a cylinder, a sleeve slidable on the shank, a centering head slidable on the sleeve havin 15 a pin for engaging the cylinder to be groun and a grinding tool carrried by the lower end of the shank.

In testimony whereof I aflix my signature.

JOHN H. HELMS. 

